Coeval star formation and black hole growth in the most massive galaxies

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Scientific paper

High redshift radio galaxies (HzRGs) are extremely powerful, rare, radio-loud AGN whose hosts are known to be among the most massive galaxies in the Universe. While it is expected that the AGN has a strong contribution to the bolometric output, about a third of HzRGs have sub-mm detections which implies considerable star formation in the host galaxy. While observations at these wavelengths inform us of the cold dust associated with the galactic star forming regions, they reveal little about the AGN buried deep within. At mid-infrared (MIR) wavelengths however, both components can play an important role in terms of the energy output of such objects. In order to disentangle the contributions from AGN activity and star formation, we obtained MIR spectra of a sample of HzRGs (1

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